SMAKN Blue SRD-24VDC-SL-C 4 Channel DC 24V High/Low Level Power Relay Module Board Product Name : Optocoupler Driver Relay Module;Relay Type : SRD-24VDC-SL-C Coil Voltage : DC 24V;Pole Number : 4 Channel Load : 10A, AC 250V/125V, DC 30V/28V;Overall Size : 7.3 x 5 x 1.8cm/2.9" x 2" x 0.7"(L*W*H) Materials : Metal, Plastic, Electric Parts;Main Color : Red, Blue Weight : 66g;Package Content : 1 x Optocoupler Driver Relay Module